Mitsubishi Evolution X. Manual — part 124

ACTUATOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-25

ACTUATOR

M2132002000591

INJECTOR

An injector is an injection nozzle with the electromagnetic valve
that injects fuel based on the injection signal sent by ECM. 1
injector is installed in the intake manifold of each cylinder and
fixed to the fuel rail. When electricity flows through the solenoid
coil, the plunger gets sucked in. The ball valve is integrated
with the plunger, and gets pulled together with the plunger till
the fully open position so that the injection hole is fully open
and the fuel gets injected.

AK700570

Fuel

Plate

Ball valve

Plunger

Solenoid coil

Connector

Filter

AD

ACTUATOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-26

Voltage from the battery gets applied from the injector relay to
the injector and up to the ECM. ECM turns ON its power tran-
sistor and prepares the injector's ground circuit. Thus, current
flows through the injector while power transistor is ON and the
injector injects fuel.

THROTTLE ACTUATOR CONTROL MOTOR

A throttle actuator control motor is installed in throttle body. The
throttle actuator control motor performs the Open/Close of the
throttle valve through the reduction gear. ECM changes current
direction according to the Open/Close direction and also
changes current to the motor coil to control the throttle actuator
control motor.
Throttle actuator control motor is composed of a good
response, low energy, and small DC motor with brush and can
generate rotation force corresponding to the current applied on
the coil. When there is no current passing through the throttle
actuator control motor, the throttle valve remains at a pre-
scribed opening angle. So, even if current stops because of a
fault in the system, a minimum level of running remains possi-
ble.

AK704676

From ETACS-ECU

From MFI relay

Injector relay

Injectors

OFF

ON

ECM

AB

No. 1

No. 2

No. 3

No. 4

AK704677

AB

Throttle body

Throttle actuator
control motor

ACTUATOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-27

IGNITION COIL

Refer to GROUP 16

− Ignition Coil

P.16-4

.

EVAPORATIVE EMISSION PURGE SOLENOID

Refer to GROUP 17

− Emission Control − Evaporative Emis-

sion Control System

P.17-11

.

TURBOCHARGER WASTEGATE SOLENOID

Two turbocharger wastegate solenoid, which are placed paral-
lel near the ECM, control the amount of leakage of the intake
charge pressure that is introduced into the turbocharger waste-
gate actuator.The turbocharger wastegate solenoid is a duty
control type solenoid valve. When current is not passing
through the coil, nipple A is kept airtight. When current passes
through the coil, air can pass between nipple A and B. ECM
changes the ON duty ratio to control the amount of leakage of
the intake charge pressure.

AK602231

Throttle actuator
control motor

Throttle actuator
control motor relay

MFI relay

To ECM

Power supply

OFF

ON

OFF

ON

AE

From battery

ECM

AK702855

To air cleaner
clean side

To turbocharger
wastegate actuator

AD

A

B

ACTUATOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-28

INTAKE ENGINE OIL CONTROL VALVE

The intake engine oil control valve is installed on the intake side
of the cylinder head. Receiving the duty signal from the ECM,
the intake engine oil control valve moves the spool valve posi-
tion and divides the oil pressure from the cylinder block into the
advanced chamber and the retarded chamber of the V.V.T.
sprocket as well as continually changes the intake camshaft
phase. The ECM moves the spool valve position by increasing
and decreasing ON duty ratio of the intake engine oil control
valve and allows the intake camshaft to be at the target phase
angle. When the duty ratio increases, the spool valve moves.
The sprocket rotates toward the advanced angle side. When
the duty ratio decreases, the sprocket rotates toward the
retarded angle side. When the medium duty ratio, at which the
spool valve is at the medium position, is achieved, all the oil
passages are closed. This allows the phase angle to be kept
constant. The ECM changes and controls the duty ratio in
accordance with the engine operation to get the optimum
phase angle.

AK601180

ECM

12V

OFF

ON

T

60ms

0V

AI

From MFI relay

The longer the ON time (T), the larger the
amount of leakage of the intake charge pressure

Turbocharger
wastegate solenoid

AK604740AD

Spool valve movement

Retard
chamber

Spring

Drain

Oil pressure

Coil

Plunger

Drain

Advance
chamber

AK700721

ECM

Intake engine
oil control valve

AD

From MFI relay